Preprocedure ultrasound imaging combined with palpation technique in epidural labor analgesia

Table 1 Patient baseline characteristics

All parturient	Combined group (n = 36)	Palpation group (n = 36)	P value
Age (yr)	29.25 ± 3.05	29.39 ± 2.72	0.248
Height (cm)	162.06 ± 4.65	162.08 ± 5.04	0.507
Weight (kg)	72.56 ± 10.2	69.33 ± 7.96	0.645
BMI (kg/m2)	27.61 ± 3.59	26.37 ± 2.67	0.213
ASA classification	2.0 ± 0.61	2.0 ± 0.53	0.985

All values are expressed as the mean ± SD. No significant differences between the two groups. ASA: American Society of Anesthesiologists; BMI: Body mass index.